Process of casting steel



of Castin Steel, of which the the speci cation- DANIEL TODD mam, 0F WINNIPEG, mAnrronn, Gamma i 'nocnss or cns'rme s'rnnn.

1,327,398. I No Drawing.

To all whom it may concern:

Be it known that I, DANIEL TODD MAIN, of the city of Winnipeg, in the Province of Manitoba, Canada, have invented certain new and useful Improvements'in Processes following is The invention relates to improvements in processes of casting steel, particularly high speed steel, and the object of the invention is to provide a process which will permit of the direct casting into the shape required of high speed steel and without necessitating forging as is customarily done.

The mode of practising my invention is:-

as follows v A quantity of high speed steel, such as broken tools usually found in a shop, are

put into a crucible and the crucible is heated in a furnace to a high temperature until the steel is melted. After melting, a quantity of manganese and a quantit of silicon are added to the molten mass, t e quantity being preferably one per cent. of manganese and one-half per cent. of silicon in proportion to the total'weight of the mass in the crucible.

The adding of these materials causes a disturbance in. the crucible and the heating is continued until this disturbance subsides. The molten metal is then poured directly into sand molds which have been previously prepared and are of the size and shape of the finished castin which it is desired'to' produce. The mol s and contents are then put back into the furnace and thefiw is let die out.

This allows for the gradual cooling of the castings. After an interval of time, that is to say, after the castin s have cooled the. molds are opened and t e castings. are removed. They are then cleaned and afterward annealed in the ordinary way in an annealing furnace.

After annealing or ground to a finish.

Specification of Letters ratent.

the castings are machined Patented'Jan. G, 1920.

Application filed June i7, 1318. Serial No. 240,895.

In the above process it is particularly This process is particularly valua le' f0 producing drills and such irregular shap high speed tools as the tools can be cast .di'-

'rectly in the moldsinto the specialshape required and it is only 'a matter of cleaning and annealing and finally finishing, thereby avoiding having either to forge or machine to shape as is customarily done and allowing of the tremendous saving effected by utilizing broken tools to re-cast new ones.

The finished tool cast by my rocess is entirely free of blow holes and wil maintaina keen cutting edge.

, What I claim as my invention is 1. The process of. casting high speed tools I from broken pieces of high speed steel which cons sts in melting the pieces of steel in a crucible, adding one per cent. of manganese noted that no forging is'done, the high speed steel being cast directly into the shape 'required which may be regular or irre lar., I

and one-half per cent. of silicon to the molteh mass and afterward casting the molten mass in molds previously prepared and of the shape required for the finished tool.

2. The process of casting high speed tools from broken pieces of high speed steel which consists in melting the pieces of steel in a crucible, adding one per cent. of manganese and one-half per cent. of silicon to the molten mass and continuing to heat the mass for a period of time, then pouring the mass directly into previously prepared sand molds of the shape of the tool required and finally cleaning, annealing and machiningthe castin% after the same has cooled. igned at Winnipeg, this 28 day of May, 1918. I

DANIEL Ton n MAIN.

In the presence of- I G. S. Roseanne, K. B. WAKEFIELD. 

